Source : Webster's Revised Unabridged Dictionary (1913)

Chockablock \Chock"a*block\, a. (Naut.)
   Hoisted as high as the tackle will admit; brought close
   together, as the two blocks of a tackle in hoisting.

Source : WordNet®

chockablock
     adj : packed full to capacity; "chowder chockablock with pieces of
           fish" [syn: {chockablock(p)}, {chock-full}, {chockful},
            {choke-full}, {chuck-full}, {cram full}]